Its production started in 1939 and to this project joined many Italians
factories: Radiomarelli, CGE, Safar, Allocchio Bacchini, Watt,
Philips, Phonola, Telefunken and others.

The wood case and the chassis is similar all factories.

The circuit is a reflex superheterodyne with only three tubes: a
converter, a second tube which has three functions (IF/LF amplifier
and detector), a rectifier.

Usually this radios has the American tubes: 6A7
, 6AY8 , 80,
in other cases are used the European tubes: ECH4
, EBL1 , AZ 1.

One of the most interesting features of this chassis is the 6AY8 tube .

This tube is a double diode /pentode manufactured by the Italian FIVRE
and was used in few type of radios.

The
low use of this type of tube led to low production and today is very
hard to find it.

In
the case which are used the European tubes the triple function is
made by theEBL1 which is easily available.

The pentode of this tube has two simultaneous functions: IF and LF
amplifier, for this reason the circuit of this radio is critical.

This kind of radio didnít works very well moreover there was problems to repair it also, so the
radio mans, in some cases,modified the Radio Roma
inserting a fourth tube in the chassis and sometimes the 6AY8 was
replaced with an other most common type.